JP6620548B2 - Display device - Google Patents

Description

  The present invention relates to a display device.

  By composing a display device by overlapping two types of display panels (for example, liquid crystal display panels) having different roles related to image display, more complicated image display is possible (see Patent Document 1). Further, the contrast can be improved by providing a gap between the two liquid crystal display panels.

  In the display device having the above-described configuration, foreign matter easily enters the gap between the two liquid crystal display panels. If foreign matter enters the gap between the two liquid crystal display panels, the display image deteriorates and a defect occurs.

Japanese Patent No. 5640178

  The present invention provides a display device capable of suppressing deterioration of display characteristics.

A display device according to an aspect of the present invention includes a first display panel, a second display panel disposed above the first display panel via an air layer, and a first connected to the first display panel. A case having a wiring part, a second wiring part connected to the second display panel, and an opening for accommodating the first and second display panels and pulling out the first and second wiring parts to the outside If, busy technique the opening comprises a closing member made of a material having air permeability. The closing member is in contact with a first member provided between the first wiring portion and the second wiring portion, and one side surface of the first member, and one of the first and second wiring portions. A second member provided between the side surface of the first member and the first end of the opening, and the other side surface of the first and second wiring portions and the opening, contacting the other side surface of the first member. And a third member provided between the second end of the part.

  ADVANTAGE OF THE INVENTION According to this invention, the display apparatus which can suppress that display characteristics deteriorate can be provided.

Sectional drawing of the liquid crystal display part which concerns on 1st Embodiment. 1 is a perspective view of a liquid crystal display device according to a first embodiment. Sectional drawing of the liquid crystal display device along the AA 'line of FIG. Sectional drawing of the liquid crystal display device along the BB 'line of FIG. The figure explaining the structure of a lower case. The figure explaining the structure of a supporting member. The perspective view of a 2nd liquid crystal display panel, a 1st liquid crystal display panel, and a backlight. The figure explaining the structure of an upper case. FIG. 6 illustrates an opening of a liquid crystal display device. The figure explaining the closure member concerning a 1st embodiment. The figure explaining the liquid crystal display device to which the closure member was attached. The figure explaining the closure member concerning a 2nd embodiment. The figure explaining the closure member concerning the 1st modification. The figure explaining the obstruction | occlusion member which concerns on a 3rd modification.

  Hereinafter, embodiments will be described with reference to the drawings. However, it should be noted that the drawings are schematic or conceptual, and the dimensions and ratios of the drawings are not necessarily the same as the actual ones. Further, even when the same portion is represented between the drawings, the dimensional relationship and ratio may be represented differently. In particular, the following embodiments exemplify an apparatus and a method for embodying the technical idea of the present invention, and the technical idea of the present invention depends on the shape, structure, arrangement, etc. of components. Is not specified. In the following description, elements having the same function and configuration are denoted by the same reference numerals, and redundant description will be given only when necessary.

[1] First Embodiment [1-1] Configuration of Liquid Crystal Display Unit 10 The liquid crystal display unit 10 of the present embodiment is a liquid crystal display panel used for an electronic wristwatch, for example. FIG. 1 is a cross-sectional view of the liquid crystal display unit 10 according to the first embodiment. The liquid crystal display unit 10 includes a first liquid crystal display panel 12 and a second liquid crystal display panel 14, and the first liquid crystal display panel 12 and the second liquid crystal display panel 14 are stacked via a transparent member (for example, an air layer) 13. Is done.

  The first liquid crystal display panel 12 performs character display and image display (hereinafter referred to as information display) with a large amount of information, and can perform color display. The first liquid crystal display panel 12 includes a transmissive liquid crystal display panel with a color filter. That is, the first liquid crystal display panel 12 modulates the light from the backlight 11 to display an image.

  The second liquid crystal display panel 14 is a pattern display type that performs character display and graphic display (hereinafter referred to as character display) with a small amount of information, and can display in a transparent state and a scattered state, that is, monochrome display. Character display includes display of characters and figures with a small amount of information, clock display (segment display), and the like. The second liquid crystal display panel 14 is composed of, for example, a liquid crystal display panel selected from polymer dispersed liquid crystal (PDLC) or polymer network liquid crystal (PNLC). Since the second liquid crystal display panel 14 does not use a polarizing plate, absorption of the light amount of the liquid crystal display panel itself can be greatly reduced, and a bright screen can be obtained. The second liquid crystal display panel 14 has visibility at the bottom of the panel and can be driven with a small amount of power.

  As described above, in the liquid crystal display unit 10 of the present embodiment, the second liquid crystal display panel 14 performs character display (including clock display and standby display), and the first liquid crystal display panel 12 has a larger amount of information than the character display. Display.

  The first liquid crystal display panel 12 and the second liquid crystal display panel 14 are stacked via the transparent member 13. The transparent member 13 is in contact with the lower substrate 40 of the second liquid crystal display panel 14, and the refractive index of the transparent member 13 is set to be different from the refractive index of the lower substrate 40. The transparent member 13 may be a transparent material that satisfies the above conditions, and may be a gas or a liquid. In the present embodiment, the transparent member 13 is composed of, for example, an air layer 13a. The air layer 13 a is enclosed between the first liquid crystal display panel 12 and the second liquid crystal display panel 14 by a spacer (or a sealing material) 18. The air layer 13a may be sealed between the first liquid crystal display panel 12 and the second liquid crystal display panel 14, or may not be sealed. By providing the air layer 13 a between the first liquid crystal display panel 12 and the second liquid crystal display panel 14, the light incident on the second liquid crystal display panel 14 from the display surface side is transmitted to the lower substrate 40 and the air layer 13 a. Reflects at the interface. As a result, bright display by the second liquid crystal display panel 14 can be realized, and the contrast of the liquid crystal display unit 10 can be improved.

  On the surface opposite to the display surface of the liquid crystal display unit 10, a light source unit (backlight) 11 is disposed to be opposed. The backlight 11 is a surface light source. As the backlight 11, for example, a direct-type or sidelight (edge light type) LED backlight or an EL (Electroluminescence) backlight is used.

  A touch panel 15 is provided on the display surface side of the second liquid crystal display panel 14. The touch panel 15 includes a transparent substrate (for example, a glass substrate) 16 and a touch sensor 17. The touch panel 15 detects that the user has touched the panel, and further specifies the touched position, that is, the coordinates of the touch position. The touch panel 15 may be any of a resistance film method, a capacitance method, an electromagnetic induction method, an ultrasonic surface elasticity method, an infrared scanning method, and the like.

(Configuration of the first liquid crystal display panel 12)
Next, the structure of the first liquid crystal display panel 12 will be described. The first liquid crystal display panel 12 uses an active matrix system in which active elements are arranged for each pixel.

  The first liquid crystal display panel 12 includes a TFT substrate 20 on which TFTs (Thin Film Transistors) as active elements (switching elements) and pixel electrodes are formed, a color filter and a common electrode, and is opposed to the TFT substrate 20. A color filter substrate (CF substrate) 21 to be disposed and a liquid crystal layer 22 sandwiched between the TFT substrate 20 and the CF substrate 21 are provided. The TFT substrate 20 and the CF substrate 21 are each composed of a transparent substrate (for example, a glass substrate).

  The liquid crystal layer 22 is made of a liquid crystal material sealed with a sealing material 23 that bonds the TFT substrate 20 and the CF substrate 21 together. In the liquid crystal material, the alignment of the liquid crystal molecules is manipulated in accordance with the electric field applied between the TFT substrate 20 and the CF substrate 21, and the optical characteristics change. The first liquid crystal display panel 12 of the present embodiment uses, for example, a VA mode using a vertical alignment (VA) type liquid crystal. That is, negative (N-type) nematic liquid crystal is used as the liquid crystal layer 22, and the liquid crystal molecules are aligned substantially perpendicular to the substrate surface when there is no voltage (no electric field). In the VA mode liquid crystal molecule arrangement, the long axis (director) of the liquid crystal molecule is vertically aligned when no voltage is applied, and the long axis of the liquid crystal molecule is inclined in the horizontal direction when voltage is applied (electric field application). In a liquid crystal mode other than the VA mode, a homogeneous mode or a TN (Twisted Nematic) mode can also be used. Note that the VA mode is more suitable from the viewpoint of improving contrast.

  The TFT substrate 20 is provided with a TFT 25 and a pixel electrode 26 for each pixel 24. In addition, an alignment film 27 is provided on the TFT substrate 20 so as to cover the TFT 25 and the pixel electrode 26. One display pixel (pixel) is composed of three sub-pixels having red (R), green (G), and blue (B) color filters. In the following description, the sub-pixel is referred to as a pixel unless it is particularly necessary to distinguish between the display pixel and the sub-pixel. The TFT 25 is a switching element that is formed on the liquid crystal layer 22 side of the TFT substrate 20 and switches on / off of the pixel 24.

  The pixel electrode 26 is provided for each pixel 24 and is formed over the entire area of the pixel 24 corresponding thereto. The pixel electrode 26 is for applying a voltage to the liquid crystal layer 22 and is electrically connected to one end of the current path of the TFT 25. The pixel electrode 26 is made of a transparent conductive film such as ITO (indium tin oxide). The alignment film 27 controls the alignment of liquid crystal molecules.

  A color filter 28, a common electrode 29, and an alignment film 30 are provided on the CF substrate 21. The color filter 28 is provided on the liquid crystal layer 22 side of the CF substrate 21 and includes colored members of three colors, a red filter R, a green filter G, and a blue filter B. Each of the red filter R, the green filter G, and the blue filter B is disposed at a position facing the pixel electrode 26 and constitutes a sub-pixel. A light shielding film (black matrix) BK for preventing color mixture is formed between the red filter R, the green filter G, and the blue filter B.

  The common electrode 29 is provided on the liquid crystal layer 22 side of the color filter 28 and is formed in a planar shape over the entire display area. The common electrode 29 is made of a transparent conductive film such as ITO. The alignment film 30 is paired with the alignment film 27 and controls the alignment of liquid crystal molecules. In this embodiment, the alignment films 27 and 30 are in a state where there is almost no potential difference between the pixel electrode 26 and the common electrode 29, that is, in a state where no electric field is applied between the pixel electrode 26 and the common electrode 29. The liquid crystal molecules are aligned substantially perpendicular to the substrate surface.

  A phase difference plate 31 and a polarizing plate 32 are provided on the backlight 11 side of the TFT substrate 20. A retardation plate 33 and a polarizing plate 34 are provided on the display surface side of the CF substrate 21. The polarizing plates 32 and 34 extract light having a vibrating surface in one direction parallel to the transmission axis, that is, light having a polarization state of linearly polarized light, from light having a vibrating surface in a random direction. The polarizing plates 32 and 34 are arranged so that the absorption axis and the transmission axis are orthogonal to each other in the plane.

  The phase difference plates 31 and 33 have refractive index anisotropy, and are arranged so that the slow axis and the fast axis are orthogonal to each other in the plane. The phase difference plates 31 and 33 have a predetermined retardation (a phase difference of λ / 4 when λ is a wavelength of light transmitted) between light of a predetermined wavelength that transmits the slow axis and the fast axis. Has the function to give. That is, the phase difference plates 31 and 33 are composed of λ / 4 plates. The slow axes of the phase plates 31 and 33 are set to approximately 45 ° with respect to the transmission axes of the polarizing plates 32 and 34, respectively.

  In addition, the angle which prescribes | regulates the polarizing plate and phase difference plate mentioned above shall contain the error which can implement | achieve a desired operation | movement, and the error resulting from a manufacturing process. For example, the above approximate 45 ° includes a range of 45 ° ± 5 °. For example, the orthogonality mentioned above includes a range of 90 ° ± 5 °.

(Configuration of the second liquid crystal display panel 14)
Next, the structure of the second liquid crystal display panel 14 will be described. The second liquid crystal display panel 14 includes a lower substrate 40 on which a common electrode is formed, an upper substrate 41 on which a display electrode is formed and disposed to face the lower substrate 40, and between the lower substrate 40 and the upper substrate 41. And a sandwiched liquid crystal layer 42. The surface of the upper substrate 41 opposite to the liquid crystal layer 42 corresponds to the display surface of the liquid crystal display unit 10. Each of the lower substrate 40 and the upper substrate 41 is composed of a transparent substrate (for example, a glass substrate).

  A common electrode 43 is provided on the lower substrate 40. The common electrode 43 is formed in a planar shape over the entire display area. A plurality of display electrodes 44 are provided on the upper substrate 41. The plurality of display electrodes 44 are processed into a shape corresponding to a character that can be displayed on the second liquid crystal display panel 14. The common electrode 43 and the display electrode 44 are each composed of a transparent conductive film such as ITO (indium tin oxide). A UV (ultraviolet) cut film 47 is provided on the display surface side of the upper substrate 41.

  The liquid crystal layer 42 is sealed by a sealing material 46 that bonds between the lower substrate 40 and the upper substrate 41. As described above, the liquid crystal layer 42 is composed of polymer dispersed liquid crystal (PDLC) or polymer network liquid crystal (PNLC). The PNLC has a structure in which a liquid crystal material is dispersed in a polymer network 45, and the liquid crystal material in the polymer network 45 has a continuous phase. PDLC has a structure in which liquid crystal is dispersed by a polymer, that is, liquid crystal is phase-separated in the polymer. As the polymer layer (polymer layer), a photocurable resin can be used. For example, PNLC irradiates a solution in which a liquid crystal material is mixed with a photopolymerizable polymer precursor (monomer) with ultraviolet rays, polymerizes the monomer to form a polymer, and the liquid crystal material is dispersed in the polymer network. Is done. As the liquid crystal material of the liquid crystal layer 42, a positive type (P type) nematic liquid crystal is used. That is, the major axis (director) of the liquid crystal molecules is randomly oriented when there is no voltage (no electric field), and the director of the liquid crystal molecules is oriented substantially perpendicular to the substrate surface when a voltage is applied (electric field application).

[1-2] Configuration of Liquid Crystal Display Device 50 Next, the configuration of the liquid crystal display device 50 including the liquid crystal display unit 10 illustrated in FIG. 1 will be described. FIG. 2 is a perspective view of the liquid crystal display device 50. FIG. 3 is a cross-sectional view of the liquid crystal display device 50 taken along the line AA ′ of FIG. 4 is a cross-sectional view of the liquid crystal display device 50 taken along line BB ′ of FIG. In the following description, illustration of the touch panel 15 is omitted. The touch panel 15 is provided on the display surface side of the second liquid crystal display panel 14. Further, the touch panel 15 may not be provided according to the specifications required for the liquid crystal display device 50.

  The thickness of the liquid crystal layer is sufficiently thinner than the thickness of the upper and lower transparent substrates sandwiching the liquid crystal layer. Therefore, for simplification of the drawings, in the cross-sectional views of FIGS. 3 and 4, the first liquid crystal display panel 12 is represented by only the upper and lower transparent substrates 20 and 21, and similarly, the second liquid crystal display panel 14 is Only the transparent substrates 40 and 41 are shown.

  A support member 55 that supports the backlight 11, the first liquid crystal display panel 12, and the second liquid crystal display panel 14 is provided in the lower case 51. That is, the backlight 11, the first liquid crystal display panel 12, and the second liquid crystal display panel 14 are arranged at a predetermined level (height) in the vertical direction (stacking direction) by the support member 55. Inside the support member 55, the backlight 11, the first liquid crystal display panel 12, and the second liquid crystal display panel 14 are accommodated in this order.

  The upper case 52 is put on the lower case 51 and is fixed to the lower case 51. The upper case 52 has an opening through which light for displaying an image passes.

  As a method of fixing the lower case 51 and the upper case 52, for example, a plurality of protrusions are provided in the lower case 51, and a plurality of openings are provided in the upper case 52. One opening of the upper case 52 is disposed at a position corresponding to one protrusion of the lower case 51 and has the same size. The size of one opening of the upper case 52 and one protrusion of the lower case 51 is, for example, about 1 to 2 mm. The plurality of protrusions of the lower case 51 are provided uniformly on the four sides of the lower case 51, and the plurality of openings of the upper case 52 are provided uniformly on the four sides of the upper case 52. Then, the lower case 51 and the upper case 52 are fixed by fitting the protrusion of the lower case 51 and the opening of the upper case 52. Further, the lower case 51 and the upper case 52 may be fixed using screws or the like.

Below, each part which comprises the liquid crystal display part 10 is demonstrated concretely.
(Lower case 51)
FIG. 5 is a diagram illustrating the configuration of the lower case 51. 5 (a) is a perspective view, FIG. 5 (b) is a cross-sectional view taken along the line AA 'in FIG. 5 (a), and FIG. 5 (c) is taken along the line BB' in FIG. 5 (a). FIG.

  The (planar) outer shape seen from above the lower case 51 is, for example, a quadrangle, and has a size and depth that can accommodate the backlight 11, the first liquid crystal display panel 12, and the second liquid crystal display panel 14. . One side surface of the lower case 51 is provided with a wiring portion connected to the first liquid crystal display panel 12 and an opening 51A for drawing out the wiring portion connected to the second liquid crystal display panel 14 to the outside. The lower case 51 is made of, for example, metal.

(Supporting member 55)
FIG. 6 is a diagram illustrating the configuration of the support member 55. 6A is a perspective view, FIG. 6B is a cross-sectional view taken along the line AA ′ of FIG. 6A, and FIG. 6C is a line BB ′ of FIG. 6A. FIG.

  The support member 55 has a size that fits in the lower case 51 and is fitted into the lower case 51. That is, the outside size of the support member 55 is substantially the same as the inside size of the lower case 51.

  The support member 55 has a step 55B for fixing the second liquid crystal display panel 14. The support member 55 may be provided with a step for fixing the first liquid crystal display panel 12. The step 55 </ b> B of the support member 55 is for providing an air layer 13 a between the first liquid crystal display panel 12 and the second liquid crystal display panel 14. That is, the step 55B of the support member 55 serves as the spacer 18 in FIG.

  One side surface of the support member 55 is provided with a wiring portion connected to the first liquid crystal display panel 12 and an opening portion 55A for drawing out the wiring portion connected to the second liquid crystal display panel 14 to the outside. The support member 55 is made of, for example, resin.

(Backlight 11, first liquid crystal display panel 12, and second liquid crystal display panel 14)
7A is a perspective view of the second liquid crystal display panel 14, FIG. 7B is a perspective view of the first liquid crystal display panel 12, and FIG. 7C is a perspective view of the backlight 11.

  A wiring unit 54 is connected to the second liquid crystal display panel 14. The wiring part 54 is comprised, for example from a flexible printed circuit board (FPC: flexible printed circuit).

  A wiring portion 53 is connected to the first liquid crystal display panel 12. The wiring part 53 is comprised, for example from FPC. The first liquid crystal display panel 12 is provided with a driver 12A. The driver 12A drives the pixel 24 (specifically, the TFT 25, the pixel electrode 26, and the common electrode 29) using various control signals and various voltages sent from the outside. The wiring parts 53 and 54 are connected to a power supply circuit, a control circuit, and the like.

  The backlight 11 is shown in a simplified manner in FIG. 7C, but is composed of a surface light source as described above. The backlight 11 includes, for example, a reflection sheet, a light guide plate, and a diffusion sheet that are sequentially stacked, and LEDs that are provided on the side surfaces of these stacked bodies.

(Upper case 52)
FIG. 8 is a diagram illustrating the configuration of the upper case 52. 8A is a perspective view, FIG. 8B is a cross-sectional view taken along the line AA ′ of FIG. 8A, and FIG. 8C is a line BB ′ of FIG. 8A. FIG.

  The upper case 52 has a slightly larger outer shape than the lower case 51. That is, the inner size of the upper case 52 is substantially the same as the outer size of the lower case 51. The upper case 52 has an opening 52 </ b> A for allowing light from the liquid crystal display unit 10 to pass therethrough. The size of the opening 52A is set to be the same as or slightly larger than the display area of the liquid crystal display unit 10. One side surface of the upper case 52 is provided with a wiring part connected to the first liquid crystal display panel 12 and an opening part 52B for drawing out the wiring part connected to the second liquid crystal display panel 14 to the outside. The lower case 51 is made of, for example, metal.

[1-3] Configuration of Closure Member In the liquid crystal display device 50 according to the present embodiment, an air layer (space) 13 a is provided between the first liquid crystal display panel 12 and the second liquid crystal display panel 14. If a foreign substance enters the air layer 13a, the display characteristics of the liquid crystal display device 50 deteriorate and a defect occurs. As a result, the yield of the liquid crystal display device 50 decreases, and the manufacturing cost increases.

  In the present embodiment, a blocking member for closing the opening of the liquid crystal display device 50 is newly provided in order to prevent foreign matter from entering the internal region surrounded by the upper case 52 and the lower case 51.

  First, the opening 50A of the liquid crystal display device 50, which is a foreign substance entry path, will be described. FIG. 9 is a diagram illustrating the opening 50 </ b> A of the liquid crystal display device 50. The opening 50A of the liquid crystal display device 50 includes an opening 51A of the lower case 51 shown in FIG. 5, an opening 55A of the support member 55 shown in FIG. 6, and an opening 52B of the upper case 52 shown in FIG. Corresponds to the overlapping area.

  A wiring part 53 for the first liquid crystal display panel 12 and a wiring part 54 for the second liquid crystal display panel 14 are drawn out from the opening 50A of the liquid crystal display device 50. The opening 50 </ b> A of the liquid crystal display device 50 has a gap S <b> 1 between the wiring part 53 and the wiring part 54 and gaps S <b> 2 and S <b> 3 on both sides of the wiring parts 53 and 54. These gaps S1 to S3 serve as foreign substance intrusion paths.

  FIG. 10 is a diagram illustrating a closing member 60 for closing the opening of the liquid crystal display device 50. 10A is a perspective view, FIG. 10B is a top view, FIG. 10C is a front view, and FIG. 10D is a side view. When the opening 50A of the liquid crystal display device 50 is viewed from the front, the X direction is the horizontal direction, the Y direction is the depth direction, and the Z direction is the vertical direction (height direction). FIG. 11 is a diagram illustrating the liquid crystal display device 50 to which the closing member 60 is attached. 11A is a cross-sectional view of the liquid crystal display device 50 taken along the line BB ′, and FIG. 11B is a view of the opening 50A of the liquid crystal display device 50 as viewed from the front.

  The closing member 60 includes a first member 60A, a second member 60B, and a third member 60C. The first member 60A has a function of closing the gap S1. The second member 60B has a function of closing the gap S2. The third member 60C has a function of closing the gap S3. The closing member 60 (consisting of the first member 60A, the second member 60B, and the third member 60C) has an H shape.

  The first member 60 </ b> A has a bottom surface in contact with the wiring portion 53 and a top surface in contact with the wiring portion 54. The thickness of the first member 60A is set to be approximately the same as or slightly longer than the distance between the wiring portion 53 and the wiring portion 54 (plus 0.2 mm or less). The length in the X direction of the first member 60A is set to be approximately the same as the width (length in the X direction) of the wiring parts 53 and 54. The length in the Y direction of the first member 60A is set to be approximately the same as or longer than the distance from the end of the upper case 52 to the end of the second liquid crystal display panel 14.

  One side surface of the second member 60B is in contact with one side surface of the first member 60A, one side surface of the wiring portion 53, and one side surface of the wiring portion 54, and the other side surface of the second member 60B is , Contact one end of the opening 50A in the X direction. The width (length in the X direction) of the second member 60B is set to be approximately the same as or slightly longer (plus 0.2 mm or less) than the width (length in the X direction) of the gap S2 in FIG. The thickness (length in the Z direction) of the second member 60B is set to be approximately the same as or slightly longer (plus 0.2 mm or less) than the height of the gap S2 (length in the Z direction). The length of the second member 60B in the Y direction is set to be approximately the same as the length of the first member 60A in the Y direction.

  One side surface of the third member 60C is in contact with the other side surface of the first member 60A, the other side surface of the wiring portion 53, and the other side surface of the wiring portion 54, and the other side surface of the third member 60C is The other end of the opening 50A in the X direction is brought into contact. The width (length in the X direction) of the third member 60C is set to be approximately the same as or slightly longer (plus 0.2 mm or less) than the width (length in the X direction) of the gap S3 in FIG. The thickness (length in the Z direction) of the third member 60C is set to be approximately the same as or slightly longer (plus 0.2 mm or less) than the height of the gap S3 (length in the Z direction). The length of the third member 60C in the Y direction is set to be approximately the same as the length of the first member 60A in the Y direction.

  The centers in the Z direction of the first member 60A, the second member 60B, and the third member 60C are set at the same position. That is, the first member 60A is provided at the center in the Z direction of the second member 60B, and the first member 60A is provided at the center in the Z direction in the Z direction of the third member 60C. In the present embodiment, the first member 60A, the second member 60B, and the third member 60C are integrally configured.

  By fitting the closing member 60 into the opening 50A of the liquid crystal display device 50, the gaps S1 to S3 described with reference to FIG. 9 can be closed. Thereby, it can suppress that a foreign material penetrate | invades in the liquid crystal display device 50. FIG.

(Material of closing member 60)
The closing member 60 (first to third members 60A to 60C) is made of a material having air permeability and / or elasticity. Examples of the material having elasticity include silicon and rubber.

  Examples of the air-permeable material include urethane foam (polyurethane foam), foamed polyethylene, and nonwoven fabric. Urethane foam is a porous polyurethane in which bubbles are retained. A nonwoven fabric is a porous sheet in which fibers are overlapped and bonded in a three-dimensional structure.

  Since the closing member 60 has air permeability, air can enter between the first liquid crystal display panel 12 and the second liquid crystal display panel 14 when the liquid crystal display device 50 packed in a vacuum state is opened. Thereby, it can suppress that the 1st liquid crystal display panel 12 and the 2nd liquid crystal display panel 14 are damaged.

  Further, since the closing member 60 has elasticity, the closing member 60 can be fitted into the gaps S1 to S3 when the size of the closing member 60 is slightly larger than the gaps S1 to S3. In addition, when an impact is applied to the liquid crystal display device 50 and the wiring portions 53 and 54, the impact is absorbed by the blocking member 60 to some extent, so that the liquid crystal display device 50, the wiring portions 53 and 54, and the closing member 60 are It is possible to suppress damage.

[1-4] Effects of First Embodiment As described in detail above, in the first embodiment, the liquid crystal display device 50 includes the first liquid crystal display panel 12 and the second liquid crystal display panel 14 having different display functions. The first liquid crystal display panel 12 and the second liquid crystal display panel 14 are stacked via an air layer (space) 13a. The first liquid crystal display panel 12 and the second liquid crystal display panel 14 are stacked via an air layer (space) 13a. The first liquid crystal display panel 12 and the second liquid crystal display panel 14 are accommodated in a case (consisting of a lower case 51 and an upper case 52). The case is provided with an opening 50A for drawing out the wiring part 53 connected to the first liquid crystal display panel 12 and the wiring part 54 connected to the second liquid crystal display panel 14 to the outside. An H-shaped closing member 60 is fitted into the opening 50A.

  Therefore, according to the first embodiment, it is possible to prevent foreign matter from entering the air layer 13a between the first liquid crystal display panel 12 and the second liquid crystal display panel 14. Thereby, it can suppress that the display characteristic of the liquid crystal display device 50 deteriorates, and can suppress that the liquid crystal display device 50 becomes defective. As a result, it is possible to suppress an increase in the yield of the liquid crystal display device 50 and an increase in manufacturing cost.

  Further, even when a space is provided between the backlight 11 and the first liquid crystal display panel 12, it is possible to suppress foreign matter from entering between the backlight 11 and the first liquid crystal display panel 12. Thereby, the same effect as the above is acquired.

  In addition, it is possible to achieve both information display by the first liquid crystal display panel 12 and character display by the second liquid crystal display panel 14, and power consumption during character display can be reduced. Thereby, even when the capacity of the power source such as the primary battery is limited, the display time can be significantly increased.

  In addition, an air layer 13 a is provided between the first liquid crystal display panel 12 and the second liquid crystal display panel 14 so as to contact the lower substrate 40 of the second liquid crystal display panel 14. Thereby, since the reflected light reflected by the interface of the lower board | substrate 40 and the air layer 13a can be utilized for a display, a brighter display is realizable.

[2] Second Embodiment The wiring portion 53 and the wiring portion 54 may be bonded to the closing member 60 (specifically, the first member 60A). FIG. 12 is a diagram for explaining the closing member 60 according to the second embodiment. 12A is a cross-sectional view of the liquid crystal display device 50 taken along the line BB ′, and FIG. 12B is a view of the opening 50A of the liquid crystal display device 50 as viewed from the front.

  The first member 60 </ b> A is bonded to the wiring portion 53 using the adhesive material 61. The first member 60 </ b> A is bonded to the wiring part 54 using the adhesive 62. The materials of the first member 60A, the second member 60B, and the third member 60C are the same as those in the first embodiment.

  In the second embodiment, since the first member 60A is bonded to the wiring portions 53 and 54, the closing member 60 can be prevented from being displaced from the initial position. Further, it is possible to prevent foreign matter from entering the liquid crystal display device 50 between the first member 60A and the wiring portion 53 and between the first member 60A and the wiring portion 54.

(First modification)
FIG. 13 is a view for explaining the closing member 60 according to the first modification. 13A is a cross-sectional view of the liquid crystal display device 50 taken along the line BB ′, and FIG. 13B is a view of the opening 50A of the liquid crystal display device 50 as viewed from the front.

  60 A of 1st members are comprised from the adhesive member in which both surfaces have adhesiveness. The first member 60A is bonded to the second member 60B and the third member 60C. The configurations and materials of the second member 60B and the third member 60C are the same as those in the first embodiment.

  60 A of 1st members are comprised from the adhesive tape (adhesive tape) in which the both surfaces have adhesiveness, for example. An example of the adhesive tape is a PET (polyester) tape using a polyester film as a base material. You may use cloth (a nonwoven fabric is included) etc. as a base material of an adhesive tape. Moreover, you may use the adhesive tape without a base material.

(Second modification)
As the first member 60A, a thermosetting resin or a photocurable resin (including an ultraviolet curable resin) may be used. In the case of using, for example, a photocurable resin as the first member 60A, the first member 60A is formed between the wiring portion 53 and the wiring portion 54, and then the first member 60A is irradiated with light having a predetermined wavelength. One member 60 </ b> A is cured, and first member 60 </ b> A adheres to wiring portions 53 and 54. Thereby, the clearance S1 between the wiring part 53 and the wiring part 54 can be filled.

  The first member 60A is in contact with the second member 60B and the third member 60C. The first member 60A may or may not be adhered to the second member 60B and the third member 60C.

(Third Modification)
In the third modification, the insulating member that covers the wiring portions 53 and 54 is thickened in the region where the first member 60A is disposed. The gap between the wiring portion 53 and the wiring portion 54 is filled with the thick insulating member.

  FIG. 14 is a diagram illustrating a closing member 60 according to a third modification. 14A is a cross-sectional view of the liquid crystal display device 50 taken along the line BB ′, and FIG. 14B is a view of the opening 50A of the liquid crystal display device 50 as viewed from the front. In the example of FIG. 14, the first member 60 </ b> A is formed by partially thickening the wiring portion 53.

  When the wiring portions 53 and 54 are FPCs, for example, a polyimide resin is used as an FPC coating material (insulating material). In this example, the first member 60A is made of a polyimide resin. That is, the first member 60 </ b> A is configured integrally with the wiring portion 53. As a method of forming the first member 60A, a plurality of layers of polyimide resin are screen-printed on a partial region of the FPC (region where the first member 60A is disposed). The first member 60 </ b> A may be provided on the wiring portion 54 side by forming the wiring portion 54 thick in the partial residence.

  Also in the third modified example, the gap S1 between the wiring portion 53 and the wiring portion 54 can be filled.

  In each of the above embodiments, the first liquid crystal display panel 12 and the second liquid crystal display panel 14 may be configured by other types of display panels than those exemplified above. The first liquid crystal display panel 12 may be a transflective or reflective liquid crystal display device. As the first liquid crystal display panel 12, an organic EL (electroluminescence) display device or other self-luminous display device can be used. As the second liquid crystal display panel 14, it is possible to use a transmissive display device (preferably without a color filter) other than the polymer-dispersed liquid crystal.

  In this specification, “parallel” is preferably completely parallel, but is not necessarily strictly parallel, and includes what can be regarded as substantially parallel in view of the effects of the present invention. In addition, an error that may occur in the manufacturing process may be included. In addition, “vertical” does not necessarily have to be strictly vertical, and includes what can be regarded as substantially vertical in view of the effects of the present invention, and may include errors that may occur in the manufacturing process. good.

  Moreover, in this specification, a board and a film are the expressions which illustrated the member, and are not limited to the structure. For example, the retardation plate is not limited to a plate-like member, and may be a film having other functions described in the specification or other members. The polarizing plate is not limited to a plate-like member, and may be a film having other functions described in the specification or other members.

  In addition, the liquid crystal display device according to the present embodiment can be applied to various electronic devices other than the electronic wristwatch.

  The present invention is not limited to the above embodiment, and can be embodied by modifying the constituent elements without departing from the scope of the invention. Further, the above embodiments include inventions at various stages, and are obtained by appropriately combining a plurality of constituent elements disclosed in one embodiment or by appropriately combining constituent elements disclosed in different embodiments. Various inventions can be configured. For example, even if some constituent elements are deleted from all the constituent elements disclosed in the embodiment, the problems to be solved by the invention can be solved and the effects of the invention can be obtained. Embodiments made can be extracted as inventions.

  DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display part, 11 ... Light source part, 12 ... Liquid crystal display panel, 13 ... Transparent member, 14 ... Liquid crystal display panel, 15 ... Touch panel, 16 ... Substrate, 17 ... Touch sensor, 18 ... Spacer, 20, 21 ... Substrate , 22 ... Liquid crystal layer, 23 ... Sealing material, 24 ... Pixel, 25 ... TFT, 26 ... Pixel electrode, 27, 30 ... Alignment film, 28 ... Color filter, 29 ... Common electrode, 31, 33 ... Retardation plate, 32 , 34 ... Polarizing plate, 40, 41 ... Substrate, 42 ... Liquid crystal layer, 43 ... Common electrode, 44 ... Display electrode, 45 ... Polymer network, 46 ... Sealing material, 47 ... UV cut film, 50 ... Liquid crystal display device, DESCRIPTION OF SYMBOLS 51 ... Lower side case, 52 ... Upper side case, 53, 54 ... Wiring part, 55 ... Support member, 60 ... Closure member, 61, 62 ... Adhesive

Claims (4)

A first display panel;
A second display panel disposed above the first display panel via an air layer;
A first wiring part connected to the first display panel;
A second wiring portion connected to the second display panel;
A case for accommodating the first and second display panels and having an opening for pulling out the first and second wiring portions to the outside;
Busy Moves the opening, provided with a closing member made of a material having air permeability,
The closing member is
A first member provided between the first wiring portion and the second wiring portion;
A second member that is in contact with one side surface of the first member and provided between the one side surface of the first and second wiring portions and the first end of the opening;
A third member that contacts the other side surface of the first member and is provided between the other side surface of the first and second wiring portions and a second end portion of the opening. Display device. A first adhesive provided between the first member and the first wiring portion;
The display device according to claim 1 , further comprising a second adhesive material provided between the first member and the second wiring portion. And further comprising a support member that supports the first and second display panels and is accommodated in the case so that the air layer is provided between the first display panel and the second display panel. The display device according to claim 1 , wherein the display device is a display device. Wherein each of the first and second wiring portion, a display device according to any one of claims 1 to 3, characterized in that they are composed of FPC (flexible printed circuit).